On a scale of 1-5 ... both the jalapeno and fresno come in at 3 (medium).
On a scale of 1-10 ... red and green jalapenos hit the scale at 5.5 - red fresno at 6.5.
On the Scoville Heat Units index - both can range from as low as 2,500 on the bottom end with jalapenos going up to 8,000-10,000 ... fresnos going up to about 10,000-15,000.
A jalapeno is a jalapeno - a fresno is a hybrid based on the hotter serrano. They have similar flavors- but the red fresno is hotter.
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain